The short-run supply curve of a perfectly competitive industry with firms having identical costs is:

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In a perfectly competitive industry, the short-run supply curve is an upward rising curve because firms will supply more as prices increase, reflecting the law of supply. Each firm's marginal cost curve (above the shutdown point) is its supply curve, and aggregating these across all firms gives the industry supply curve, which typically slopes upward.

The Short-Run Supply Curve of a Perfectly Competitive Industry with Firms